7. The periodic table has a strange shape considering that the elements are in order of increasing atomic number. Explain how the periodic table is organized according to electron configuration. Be sure to answer the following two questions in your response: . What do the letters in an eleqtron configuration represent? • How does the number of groups in each block on the periodic table relate to the number of electrons in each sublevel? Word Bank: energy levels, orbital, s, p, d, f, sublevels, electrons, group, period Sentence Frames: belongs to and can be described as... can be described as... is illustrated by and widely acknowledged as...​

What is lincoln's purpose in writing this speech? question 1 options: to stress the difficulties of war to honor those who died in the war to call for an end to the war to call the country to join a new war

Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas.in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point

Nan element’s square on the periodic table, the number with the greatest numerical value represents the